Gossip Cop has suggested that 'something did happen' between Stewart and Sanders, but a source allegedly close to Stewart added: "It's not a relationship. She made a mistake. She feels awful. She's not with him."

Stewart and Pattinson first met on the set of Twilight and appeared together at the Teen Choice Awards on Sunday night (July 22) in Los Angeles.

Alongside co-star Taylor Lautner, they accepted the 'Ultimate Choice' award in recognition of the Twilight movies' international box office success.

Sanders is married to model Liberty Ross, and the couple have two children together.

Photo gallery - Kristen Stewart - her career to date in pictures:

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Panic Room (2002) A young Kristen Stewart got her first big role playing Jodie Foster's daughter in David Fincher's house-bound thriller Panic Room. Foster admitted that she saw potential in the future superstar at an early age: "Kristen isn't interested in blurting out her emotions all in front of her, and that results in really intelligent and interesting performances."
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